Mold and process of making the same.



.No. 881,558. PATENTED MAR. 10, 1908. W. P. DUN LANY.- v

MOLD AND PROCESS OF MAKING THE SAME;

APPLICATION FILED JUNE 8.1906.

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UNITED srAigns grnnr OFFICE.

WILLIAM P. DUN LANY, OF CLEVELAND, OHIO, ASSIGNOR TO JOHN A. LANNERT, OFCLEVE- LAND, OHIO.

MOLD AND PROCESS OF MAKING THE SAME.

Specification of Letters Patent.

Patented March 10, 1908.

To all whom it may concern:

Be it'known that I, WILLIAM P. DUN LANY, a citizen of the United States,residing at Cleveland, in the county of Ouyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Molds and Processes ofMaking the Same, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings.

The object of this invention is to rovide an efficient mold for use incasting a uminium, brass or bronze, so composed and constructed that itmay be used a great number of times.

One of the diificulties in molding is the roper venting of the mold. Mymold is sufciently porous to provide the vents in itself.

- The present invention'comprises the process of making the mold.

The drawings illustrate the mold and the process of making it.

Figure 1 is a cross section through a flask containing the pattern andthe molding composition in its first stage. Fig. 2 represents one of themembers of the flask after the same is separated and the patternremoved, and Fig. 3 represents the completed mold ready for use.

' I make my mold of a composition of graph ite, a refractory filler as,lava, a woody material, as pulverized cork, or sawdust, and a suitablebinder, preferably pitch. I have found the proportions of 80 per cent.graphite, 10 per cent. lava, and 10 per cent. woody matter, with enoughpitch added to make the composition plastic, to be very satisfactory.The pattern is placed on the mold board within the drag of the flask andthe same filled with my composition of matter and then the drag isturned over, the rest of the pattern put on and the cope put in place,

which is then filled with my composition, in

the usual manner of making molds.

Fig. 1 represents the mold in this condition. 1 It is now put in abaking oven, flask,

pattern and all, and is given a preliminary baking at a temperature ofsay from 400 degrees to 500 degrees Fahrenheit for say five or sixhours. The purpose of this is to drive off the moisture and make thematter adhere sufliciently for subsequent handling. The flask andpattern are then removed and the mold itself is given a final heating atthe metal which is to be cast in it.

temperature of a coke oven, approximately 2800 degrees Fahrenheit, fromforty-eight to sixty hours. In this final heating, the woody matter isentirely burned out, leaving the mold porous, so that it willautomatically vent itself; at the same time the pores are not of suchcharacter as to interfere with the smoothness of the casting.

The mold produced by my process is very strong, and, being firmly heldtogether, may be used many times in the casting of such metals asaluminium, brass or bronze. The composition of the mold varies with theThe variable element is preferably the refractory filler which should bein such proportion as to give the mold about the same coefficient ofexpansion as the metal, at the critical temperature of the metal incooling.

In the drawings, A and A." represent the molds; B and B" the flaskmembers, and (l the pattern. The mold sections are provided with apouring passageway a as usual. During the pouring a weight (notshown) isplaced on the mold to hold the parts together.

Having thus described my invention, I claim:

1. The process of making molds which consists of mixing the moldmaterial with woody matterin small particles, and subsequently heatingthe mold to a high temperature to burn out the wood to vent the moldprior to the casting of metal therein.

2. The process of making molds consisting of making the mold withpowdered combustible matter interspersed in it, giving the mold apreliminary baking in its flask, removing it from the flask, and givingit a subsequent baking at a high temperature to burn out the combustiblematter.

3. The process of making molds consisting of mixing carbon, woodymatter, and a plastic binder, preliminarily baking the mold to drive offthe moisture and make it hold together, and giving the mold a subsequentheating at a high temperature for a suitable length of time to burn outthe woody matter.

4. The process of making molds consisting of mixing graphite, comminutedvegetable matter, and pltch, preliminarily bakin the mold to drive oflthe moisture and ma e it hold together, and giving the mold a subsequentheating at a high temperature for a suitable length oftime to burn outsaid vegetable matter.

5. V The process of making molds consisting of mixing approximately 80per cent. graphite, 10 per cent. pulverized Woody material, 10 er cent.refractory filler, and enough pitch to ind the composition together,preliminarily baking the mold to drive ofi the moisture and make it holdtogether, and giving the mold a subsequent. heating at a high temperature for a suitable length of time to burn out the Woody matter.

6. The process of making molds consisting of mixing graphite, lava,powdered cork and pitch Within a flask, baking the composition and flaskat a temperature 01 from 400 degrees to 500 degrees Fahrenheit, thenremoving the flask from the mold and baking the latter at a temperatureof approximately 2800 degrees Fahrenheit, for approximately 48 hours.

7. The process of making molds consisting of forming the mold of itsfinal substance and a temporary substance, mixed therewith, andsubsequently treating it to remove the term porary substance prior tothe casting of metal therein.

8. The process of making molds consisting of making a mixture comprisingthe substance of the mold and the temporary matter in minute particles,preliminarily heating said mold to cause it to hold together, andfinally treating the mold to remove the temporary particles.

9. A process of making molds for successive casting operations,consisting of mixing carbon, comminuted vegetable matter and a plasticbinder, preliminarily baking the mold to drive off the moisture and makeit hold together, and giving the mold a subsequent heating at a hightemperature for a suitable length of time to burn out said vegetablematter, all these operations preceding the casting of metal in the mold.

In testimony whereof, I hereunto a'llix my signature in the presence oftwo witnesses.

WILLIAM P. DUN LAN Y. \Vitnesses J. A. LANNERT, ALBERT H. BATES.

